ld throws libc_nonshared.a: No such file or directory when run inside snap environment

[Mert Kirpici]

I was trying to snap an application which has a feature to create a virtual environments and I was facing an error trying to compile the netifaces module during the venv creation.

I traced that problem further and found that, during the configuration phase, the netifaces package tries to compile small programs[0] to discover the capabilities of the environment it is running in. Which was seemingly not working properly.

When I tried to compile the program manually, I discovered the error:
/snap/demo/x1/usr/bin/ld: cannot find /usr/lib/x86_64-linux-gnu/libc_nonshared.a: No such file or directory
collect2: error: ld returned 1 exit status

I tried to use the GCC_EXEC_PATH and LIBRARY_PATH but couldn't manage to get it work.
The workaround I found was to use:
```
layout:
  /usr/lib/$SNAPCRAFT_ARCH_TRIPLET/libc_nonshared.a:
    bind-file: $SNAP/usr/lib/$SNAPCRAFT_ARCH_TRIPLET/libc_nonshared.a
```
in the snapcraft.yaml.

I am attaching the snapcraft yaml that reproduces the issue, I am testing using snapcraft v7.4.3.

Reproducing steps:

sudo snap install ./demo_0.1_amd64.snap --dangerous
snap run --shell demo.demo
gcc $SNAP/test.c

[0] https://github.com/al45tair/netifaces/blob/release_0_11_0/setup.py#L139